//链接数据库
//1.引入数据库的文件
var settings = require('../setting')
//2.引入链接数据库的mongodb模块
var Db = require('mongodb').Db;
var Connection = require('mongodb').Connection;
var Server = require('mongodb').Server;

//3.创建数据库链接对象
module.exports  = new Db(settings.db,
    new Server(settings.host,settings.port),
    {safe:true});
